*{
  margin: 0 ;
  padding: 0;
  /* 内减模式 */
  box-sizing: border-box;
}
li{
  list-style: none;
}
a{
  text-decoration: none;
}
/* 清除浮动 */
.clearfix::before,.clearfix::after{
  content: "";
  display: table;
}
.clearfix::after{
  clear: both;
}


body{
  background-color: #f3f5f7;
}
/* 版心*/
.wrapper{
  width: 1200px;
  margin: 0 auto;
}
/* 头部 */
.header{
  height: 42px;
  margin-top: 30px;
  margin-bottom: 30px;
}
h1{
  float: left;
}
/* 导航 */
.nav{
  float: left;
  margin-left: 70px;
  height: 42px;
}
.nav li{
  float: left;
  margin-right: 26px;
}
.nav li a{
  display: block;
  padding: 0 9px;
  height: 42px;
  line-height: 42px;
  
  font-size: 18px;
  color: #050505;
}
.nav li a:hover{
  border-bottom: 2px solid #00a4ff;
}
.search{
  float: left;
  margin-left: 59px;
  width: 412px;
  height: 40px;
  border: 1px solid #00a4ff;
}
.search input{
   float: left;
  padding-left: 20px;
 /* 左右加一起的尺寸要小于等于410 */
  width: 360px;
  height: 38px;
  /* 去除边框 */
  border: 0;
}
/* 控制placeholder的样式 */
.search input::placeholder{
  font-size: 14px;
  color: #bfbfbf;
}
.search button{
  float: left;
  width: 50px;
  height: 40px;
  background-image: url(../images/btn.png);
  border: 0;
}
.user{
  float: right;
  margin-left: 35px;
  height: 42px;
  line-height: 42px;
}
.user img{
  /* 调整图片垂直对齐方式，middle：居中 */
  vertical-align: middle;
}


/* 轮播图 */
.banner{
  height: 420px;
  background-color: #1c036c;
}
.banner .wrapper{
  height: 420px;
  background-image: url(../images/banner2.png);
}

.banner .left{
  float: left;
  padding:  0 20px;
width: 190px;
height: 420px;
background-color: rgba(0,0,0,.3);
/* 文字能继承父级 */
line-height: 44px;
}

.banner .left span{
  float: right;
}
.banner .left a{
font-size: 14px;
color: #fff;
}
.banner .left a:hover{
  color: #00a4ff;
}
.banner .right{
  float: right;
  margin-top: 50px;
width: 228px;
height: 300px;
background-color: #fff;
}
.banner .right h2{
  height: 48px;
  background-color: #9bceea;
  text-align: center;
  line-height: 48px;
  font-size: 18px;
  color: #fff;
}
.banner .right .content{
  padding:  0 18px;
}
.banner .right .content dl{
  padding: 12px 0;
  border-bottom: 2px solid #e5e5e5;
}
.banner .right .content dl dt{
  font-size: 16px;
  color: #4e4e4e;
}
.banner .right .content dl dd{
  font-size: 14px;
  color: #4e4e4e;
}
.banner .right .more{
  display: block;
  margin: 4px 14px 0;
  width: 200px;
  height: 40px;
  border: 1px solid #00a4ff;
  font-size: 16px;
  color: #00a4ff;
  font-weight: 700;
  text-align: center;
  line-height: 40px;
}
 .goods{
  margin-top: 8px;
  padding-left: 34px;
  padding-right: 26px;
  height: 60px;
  background-color: #fff;
  /* 边框阴影 */
  box-shadow: 0px 2px 3px 0px rgba(118,118,118,.2);
  line-height: 60px;
 }
 .goods h2{
  float: left;
  font-size: 16px;
  color: #00a4ff;
 }
 .goods ul{
  float: left;
  margin-left: 30px;
 }
 .goods ul li{
  float: left;
 }
 .goods li a{
  padding: 0 30px;
  border-left: 1px solid #bfbfbf;
  font-size: 16px;
  color: #050505;
 }
 .goods .xingqu{
  float: right;
  font-size: 14px;
  color: #00a4ff;
 }
 /* 精品课程*/
 .box{
  margin-top: 35px;
 }
.box .title{
  height: 40px;
}
.box .title h2{
  float: left;
  font-size: 20px;
  color: #494949;
  font-weight: 400;
}
.box .title a{
  float: right;
  margin-right: 30px;
  font-size: 12px;
  color: #a5a5a5;
}
/* 内容 */
.box .content li{
  float: left;
  margin-right: 15px;
  margin-bottom: 15px;
  width: 228px;
  height: 270px;
  background-color: #fff;
}
.box .content li:nth-child(5n){
  margin-right: 0;
}
.box .content li h3{
  padding: 20px;
  font-size: 14px;
  color: #050505;
  font-weight: 400;
}
.box .content li p{
  padding: 0 20px;
  font-size: 12px;
  color: #999;
}
.box .content li span{
  color: #ff7c2d;
}
  /* 版权 */
  .footer{
    padding-top: 30px;
height: 417px;
background-color: #fff;
  }
.footer .left{
  float: left;
}
.footer .left p{
  margin: 20px 0 10px;
  font-size: 12px;
  color: #666;
}
.footer .left a{
  display: inline-block;
  width: 120px;
  height: 36px;
  border: 1px solid #00a4ff;
text-align: center;
line-height: 36px;
color: #00a4ff;
font-size: 16px;
}
.footer .right{
  float: right;
}
.footer .right dl{
  float: right;
  margin-left: 120px;
}